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Investments (Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Dividends on equity securities	$ 142,367	$ 116,911	$ 107,213
Total investment income	938,474	751,754	464,013
Investment expenses	(17,978)	(17,222)	(17,258)
Net investment income	920,496	734,532	446,755
Fixed maturities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest income	510,044	383,022	294,417
Short-term investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest income	124,575	106,747	33,493
Cash and cash equivalents [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest income	$ 161,488	$ 145,074	$ 28,890

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